WO1993016857A1

WO1993016857A1 - Mold for manufacturing very thin rubber molding and method of manufacturing the mold

Info

Publication number: WO1993016857A1
Application number: PCT/JP1993/000208
Authority: WO
Inventors: Tomoyuki Hayashi; Yoshiaki Tatsumi; Kinya Miyashita
Original assignee: Sohzohkagaku Co., Ltd.
Priority date: 1992-02-21
Filing date: 1993-02-22
Publication date: 1993-09-02
Also published as: EP0587903B1; US5595704A; DE69310297D1; DE69310297T2; US5667822A; EP0587903A1; EP0587903A4; CA2108888A1

Abstract

A mold for manufacturing a very thin rubber molding, wherein the body portion of the main body of the mold is immersed in a latex solution to deposit latex onto the surface of the body portion, latex deposited thereonto is heated and dried to thereby give a very thin rubber molding, at least the surface of the body portion of the main body of the mold immersed in the latex solution is made from amorphous carbon, and an electrode for current supply and a heat generating region for generating heat due to the resistance by the current supply are provided at the proximal portion of this main body of the mold. A method of manufacturing a very thin rubber molding, wherein one and the same mold can be used from an immersing step, in which the mold is immersed in the latex solution and latex is deposited onto the surface of the mold, to an inspecting step of the molding deposited onto the surface of the mold, and, simultaneously, the molding deposited onto the surface of the mold is heated and dried from the side of the mold to thereby prevent or minimize the formation of pinholes.

Description

Specification

Mold and method for manufacturing ultra-thin rubber molded product

Technical field

The present invention creates medical working gloves used in the medical field, such as condoms as contraceptives, rubber gloves for surgery, etc., and creates a clean working environment and accurately performs fine work. Molds for manufacturing ultra-thin rubber molded products such as rubber gloves for work used at work sites in the high-tech industry, etc., and for manufacturing ultra-thin rubber molded products using these molds The method. '

Background technology.

Ultra-thin rubber molded products such as condoms are generally formed from glass porcelain and are spaced at predetermined intervals on endless belts. Washing process in which the mold is successively immersed in a latex solution to adhere the latex to the surface of the mold, and the latex adhering to the surface of the mold is removed. Numerous processes such as a heating and drying process in which heating and drying are performed and vulcanization, and a testing process in which a molded product formed by a molding die is immersed in an electrolytic solution and energized to perform a pinhole inspection It has been manufactured through.

However, in such a conventional manufacturing method, after the heating and drying process, the molded product adhering to the surface of the mold is temporarily removed from the mold, and a conductive test for pinhole inspection is performed. Re-attach to the mold and in this state Since the molded product is an ultra-thin rubber product, the molded product is a very thin rubber product. The re-installation work was extremely cumbersome, and this inspection process had become the limiting step in the production of ultra-thin rubber molded products such as condoms.

Therefore, as a solution to this problem, the mold was formed from a metal material, and the molded product that had been heated and dried and adhered to the surface of the mold was immersed directly into the electrolyte solution in the inspection process. A pinhole inspection has been proposed (Japanese Patent Publication No. 47-17, 474). However, in this method, a metal material is used as a molding die, and as a result, metal ions enter the latex from the molding die, which causes rubber to become a dispersoid. The state of the colloid sol deteriorates, and it becomes impossible to adhere the latex to the surface of the mold in a good state, resulting in a large number of defective products, which is practically practical. Not converted.

In order to solve the above-mentioned problems, the present inventors formed a mold with a conductive ceramic material made of SiC, ZrB2, or a mixture thereof, and used the mold. Can be used as an inspection mold as it is, so that the complicated work of "peeling off the molding from the molding die and re-attaching the molding to the inspection die" in the inspection process can be omitted. A mold for an ultra-thin rubber molded product was proposed (Japanese Patent Laid-Open No. 1-108,012). By using this conductive ceramics mold, the metal is added to the latex during the immersion process. The production of ultra-thin rubber moldings can be carried out continuously from the washing process, the dipping process, the heating and drying process and the inspection process, without the problem of mixing in, thereby improving production efficiency. The advantage is that it can be achieved.

However, when the molding die is manufactured from the conductive ceramic material as described above, the conductive ceramic material is not only expensive itself, but also has a high specific gravity and no It is unsuitable for constructing a production line by arranging a large number of molds on the end belt, and the workability is poor, and the shape that can be formed is limited. In order to produce such a material, a grinding process for the surface and a polishing process for a mirror finish are required, and another problem that a great deal of labor and cost is required for the grinding process and the polishing process arises. It was not always satisfactory. That is, in order to manufacture a molding die using a conductive ceramic material, a binder is mixed with a powder of the ceramic material to prepare a compound, and the compound is prepared. To form an unsintered compact having the same shape as the mold, and sintering the obtained unsintered compact at a predetermined sintering temperature to form the desired conductive ceramics The mold is manufactured, and at this time, the surface can be ground into various shapes in the state of a green compact that is easy to process, or the surface can be polished to a mirror finish. Instead, the surface of a high-hardness sintered body obtained by sintering must be ground or polished to a mirror finish.

In addition, washing process, dipping process, heat drying process and inspection process In the production of ultra-thin rubber molded articles such as condoms, the thickness of the molded article produced is extremely thin, and therefore, from the latex adhering to the surface of the mold during the heating and drying process. There is a problem that a pinhole is easily generated when the solvent is removed. Regarding this problem, it is not always clear what causes pinholes, but according to the study of the present inventors, the latex adhering to the surface of the mold was heated and dried. When performing this heating and drying only by external heating, first, only the surface of the latex layer is dried first, and then the drying proceeds inside the latex layer sequentially. However, when the inside of this latex layer dries, the volatile components evaporated there break down the surface of the previously dried latex layer and come out to the outside. Therefore, this is considered to be one of the major causes of pinhole occurrence. In particular, when the molded product is a condom, the thickness of the molding opening is extremely thin, usually about 0.02 to 0.1 mm, and there is no pinhole due to the properties of the product. Production of non-defective products is not permitted, and an inspection process is required to perform pinhole inspection on all molded products manufactured for this purpose. Another important issue is how to prevent the generation of pinholes in the manufacturing process and improve product yield. Disclosure of the invention

In view of this, the present inventors consider the inspection step The complicated work of removing the molded article from the mold from the mold and reattaching it to another inspection mold can be omitted, and pinholes are generated as much as possible in the manufacturing process, especially in the heating and drying process. The present inventors have conducted intensive research on a molding die for producing an ultra-thin rubber molded article and a method for producing an ultra-thin rubber molded article using the same, and completed the present invention.

Therefore, an object of the present invention is to eliminate the troublesome work of "peeling off a molded article from a mold and reattaching it to another inspection mold" in an inspection process in the production of an ultra-thin rubber molded article. To provide a new manufacturing mold capable of preventing pinholes during the manufacturing process as much as possible.

Another object of the present invention is that it is lightweight, has good workability and can be easily formed into various shapes, and is particularly required as a mold for manufacturing a dome. An object of the present invention is to provide a mold for manufacturing a novel ultra-thin rubber molded product having a mirror-finished surface.

Furthermore, an object of the present invention is to use such a molded article of an ultra-thin rubber molded article, and to carry out the complicated procedure of "peeling the molded article from the mold and reattaching it to another inspection mold" in the inspection process. An object of the present invention is to provide a novel ultra-thin rubber molded article manufacturing method which can omit operations and minimize the occurrence of pinholes in the manufacturing process.

That is, in the present invention, the main body of the mold body is immersed in a latex solution to adhere the latex to its surface, and the attached latex is heated and dried to form an ultra-thin rubber. Manufacture goods The main body surface of the mold body, which is at least immersed in the latex liquid, is formed of amorphous carbon, and the base of the mold body has an electrode for conducting electricity. This is a molding die for manufacturing ultra-thin rubber molded products, which is provided with a heating region that generates resistance by energization.

Further, according to the present invention, at least the surface of the main body of the mold body immersed in the latex liquid is formed of amorphous carbon, and the base has a current-carrying electrode and a resistance formed by the current-carrying. Use a mold provided with a heating area that generates heat,

(a) an immersion step of sequentially immersing the mold in a latex liquid to adhere the latex to the surface of the mold;

(b) energizing the molding die to generate resistance heat in the heat generating area, thereby heating and drying the latex adhering to the surface of the molding die; and

(c) An ultra-thin process comprising immersing the molded product in the electrolytic solution as it is without removing it from the molding die, applying electricity, and performing a pinhole inspection. This is a method for producing a rubber molded product.

In the molding die of the present invention, it is necessary that at least the surface of the main body to be immersed in the latex liquid at the time of use is formed of amorphous carbon. Regarding the part other than the main body surface, even if it is formed of amorphous carbon similarly to the main body surface, other materials such as ordinary graphite material, ceramics, and conductive material are used. It may be made of ceramics, glass, porcelain, etc. and has sufficient strength as a mold. If so, it may be formed in a hollow shape. The bulk specific gravity of this amorphous force is usually obtained in the range of 1.0 to 1.9 g Zcnf, which is lower than that of glass or porcelain. The value is much lower than that of the mold, and it can be used as a lightweight mold.

Also, when heating and drying the latex adhering to the surface of the mold, heat is applied to the base of the mold so that heating from the mold side is possible. It is necessary that a heat-generating region for generating resistance heat is formed. Therefore, at least the heat-generating region formed at the base has a specific resistance value of 0.0000. ~ 0.1 Ω · αη, preferably 0.00001 to 0.01 Ω · cm, and the heat transfer from the heat generation region at the base to the main body. The coefficient power should be 10 to 0.001 ca 1 cm1 sec · ° C, preferably 5 to 0.001 calZcm · sec. ° C. By selecting such a specific resistance value at the root and a heat transfer coefficient from the root to the main body, heat generated in the heat generating region at the root is efficiently transmitted to the main body. Latex adhering to the main body can be conveniently heated and dried. In addition, in order to secure sufficient resistance heat generation in the heat generating area provided in this portion, a process for increasing electric resistance may be performed on the root portion of the mold. For example, this root portion may be formed of another material having high electric resistance, or may be formed in, for example, a double helical structure so as to increase the electric resistance. So that the resistance is higher Additives such as ceramics and glass may be added. In addition, it is necessary to provide an electrode at the base for supplying power to the above-mentioned heating area and supplying power when performing a pinhole inspection of a molded product formed on the surface of the main body. For example, using a conductive adhesive such as BT-101 manufactured by Nisshin Spinning Co., Ltd. based on carbon, plastic, metal, glass, ceramics, etc. A lead electrode may be attached, or band-like amorphous carbon may be wound around to attach.

In this way, at least a part of the surface of the main body that is immersed in the latex liquid at the time of use is composed of amorphous carbon.For the method of producing carbon, for example, phenol resin, polyacrylo A polymer material such as nitrile, polyimid, polyvinyl chloride, polyamide polyimide, vinylidene polychloride, or flann resin is used, and is subjected to a conventionally known method. It can be produced by carbonizing with.

A particularly preferred method of producing the amorphous carbon is to use a raw material of a po- lylic poimid, for example, Japanese Patent Application Laid-Open No. 215/1677 and Japanese Patent Application Laid-Open No. 3-247504. This method has the advantages of low porosity and high strength when manufactured by such a method.

In the present invention, the production of an ultra-thin rubber molded product is performed by using at least the above-mentioned mold, and at least (a) successively immersing the molded mold in a latex liquid to form a latex on the surface of the mold. Dipping process to attach grease, (b) energizing the molding die and

New paper A heating and drying step of heating and drying the latex adhering to the surface of the mold due to the generation of heat; and (c) removing the molded article from the mold from the mold. In this method, it is immersed in the electrolytic solution as it is, and a pinhole inspection is performed by applying power.

The latex used in the immersion step (a) is not particularly limited, and examples thereof include natural rubber, butadiene-styrene synthetic rubber (SBR), and pig. Jean.

Acrylonitrile synthetic rubber (NBR), butyl rubber, chloroprene rubber (CR), silicone rubber, polyacrylic rubber, fluorine-containing rubber, poly rubber Polyurethane rubber, polyisoprene, neutron, etc. Latex such as rubber-based rubber can be mentioned.

In the heating and drying step (b), the base of the mold is energized to heat the heated area to a predetermined temperature, and the latex adheres using the heat conduction from the base to the main body. The main body is heated and the latex attached to the main body is heated and dried from inside. At this time, similarly to the conventional drying process, it is preferable to use the external heating of an electric furnace or the like in combination, whereby the entire lattice is extremely thinned in its thickness direction. Heating and drying can be performed uniformly without a large temperature difference, and the generation of pinholes can be more reliably prevented. By heating and drying the latex adhering to the main body of the mold from inside, the occurrence of pinholes in the ultra-thin rubber molded product is minimized. can do. In this case, The heating temperature in the main body of the mold body, the heating temperature in external heating, the heating time, etc. are appropriately set according to the type of latex used, the amount of latex attached to the main body, etc. Usually, the heating temperature in the main body is about 80 to 170 ° C, and the heating temperature for external heating is about 80 to 170 ° C.

The molded product thus formed on the surface of the main body of the mold is subjected to a pinhole inspection in the inspection step (c). In this pinhole inspection, usually, a molded product is put on an inspection mold, immersed in an electrolytic solution, and energized to check whether or not electric continuity is observed. Pinholes are present anywhere on the molded product and are treated as defective. In the present invention, a molding die on which a molded product is molded and adhered to the surface of the main body is immersed in an electrolytic solution as it is, and this molding die is used as an inspection die. In this case, specific inspection methods and conditions can be exactly the same as those of a conventionally known method. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows a method for producing an ultra-thin rubber molded product according to Example 1 of the present invention, and is an explanatory diagram of a production line for producing a condom.

FIG. 2 is a partial cross-sectional explanatory view of a mold for manufacturing a condom according to Example 1 of the present invention, which is used in the condom manufacturing line shown in FIG. 1. .

Fig. 3 shows the condom manufacturing line of Fig. 1 FIG. 3 is an explanatory view similar to FIG. 2 showing a state in which a latex is attached to a main body of a molding die shown in FIG.

Fig. 4 is an explanatory view similar to Fig. 2 showing a state in which the condom formed on the surface of the main body of the mold shown in Fig. 2 is adhered to the condom manufacturing line of Fig. 1. is there.

FIG. 5 is a partial cross-sectional explanatory view showing a mold for manufacturing a condom manufactured in Example 2.

FIG. 6 is a partial cross-sectional explanatory view showing a mold for manufacturing a condom manufactured in Example—Example 3.

FIG. 7 is an explanatory partial cross-sectional view showing a molding die manufactured in Example 4 for manufacturing a condom. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be specifically described based on embodiments shown in the accompanying drawings.

Example 1

FIG. 1 shows a condom manufacturing line according to an embodiment of the present invention. This condom manufacturing line is basically composed of an endless belt 2 on which a number of condom molds 1 of the present invention are erected, and a water washing for washing the mold 1 with water. A tank 3, a liquid tank 4 for immersing the main body of the mold 1 washed with water in a latex liquid, and a latex adhering to the main body of the mold 1. After the preheating chamber 5 for preliminary heating and drying, and the upper part of the molded article preheated in the preheating chamber 5 is wrapped with a finger to form a reinforcing portion at the opening edge of the product condom, Heating and drying chamber for heating and drying again 6, an electrolyte tank 7 for conducting a pinhole inspection of the condom adhering to the surface of the main body of the molding die 1 dried in the heating and drying chamber 6, and a cell passing through the electrolyte tank 7. The product condom is removed from the mold 1 while removing the condom determined to be defective when passing through the product drying chamber 8 and the electrolyte tank 7. And a detaching device 9.

In addition, in the preheating chamber 5 and the heating / drying chamber 6, in addition to heating from the outside, power is applied to each mold 1 to cause the heat generating area to generate resistance heat. The attached or semi-dried latex is heated, dried and vulcanized. In the electrolyte bath 7, a DC voltage for pinhole inspection was applied between the contact electrode 7a contacting the mold 1 and the electrode 7b provided in the electrolyte. While the mold 1 passes through the electrolytic solution in the electrolyte bath 7, the command adhered to the main body of the mold 1: If there is a pinhole in the film, this pin Electric current flows through the hole, and this condom is configured to detect the presence of a pinhole as a defective product, remove the information, and transmit the information to the device 9 to remove the defective product. You.

As shown in Fig. 2, the molding die 1 used in Example 1 has a main body part M whose body is immersed in a latex liquid at the time of use and a latex part located at an upper part thereof. The body M and the base B are not immersed in the liquid, and the main body M and the base B are the core 1 b formed of isotropic graphite material. It is formed of a surface portion 1a made of amorphous carbon laminated on the surface thereof, and the molding die 1 is placed in the preheating chamber 5 and the heating drying chamber 6 at the upper end of the die body. The heating electrode 11 connected to the AC heating power supply 10 during the operation, and the amorphous carbon band-shaped electrode 12 provided with the heating area R from the heating electrode 11 are provided. It is provided. The amorphous carbon band electrode 12 not only serves as one electrode connected to the AC heating power supply 10 but also allows the molding die 1 to pass through the electrolytic solution tank 7. Contacted with the contact electrode 7a of the DC voltage power supply 13 for pinhole inspection, and was placed in the electrolyte in the electrolyte tank Ί when the pinhole was present in the molded condom. Also serves as a contact terminal through which current flows due to a short circuit with electrode Ίb.

When the main body M of the molding die 1 of the first embodiment is immersed in the latex liquid in the latex liquid tank 4 and comes out through this; As shown in the figure, a predetermined amount of latex L adheres to the surface of the main body M with a predetermined thickness, and is then preliminarily heated and dried in the preheating chamber 5 and completely heated in the heating drying chamber 6. Before drying, as shown in FIG. 4, the reinforcing portion 14 is formed around the opening edge of the molded product condom C by being wound around with a finger as shown in FIG.

Next, a molding die for producing an ultra-thin rubber molded product of the present invention, including the molding die 1 used in Example 1, and a production method thereof will be described.

[Preparation of raw material polydiimide]

Production Example 1 A mixture of 2,4-trirange isocyanate (2,4-TDI) and 2,6-trirange isocyanate (2,6-TDI) (2,4-TD I / 2, 6-TDI = 80/20) 54 g of tetrachloroethylene 500? In the presence of 0.12, a catalyst for the formation of calposimids (1-phenyl-3-methylphosphorenoxide) is used. The mixture was reacted with C for 4 hours to obtain a polycarbodiimide solution.

Production Example 2

50 g of methylene phenyldiisocyanate (MDI) was reacted with tetrachloroethylene in 82 2τ ^ in a catalyst for the formation of an olefin (1 -phenyl-3-methylphosphorenoxy) The reaction mixture was allowed to react at 120 ° C for 6 hours in the presence of 0.13 g, and the resulting reaction mixture was cooled to room temperature to precipitate the resulting polypropyldiimide, which was then filtered. The obtained precipitate was dried at 100 ° C. for 2 hours to obtain a powder of a polycarbonate.

[Manufacture of molding die]

Example 2

An isotropic graphite material (bulk density: 1.83 _g Zcm ³ , bending strength: 500 kg / cm ² ) was processed into the shape shown in the core part 1 b in FIG. 2, and the surface was obtained in the above Production Example 1. was the port re Karubojii Mi de solution spray coating, 8 3 hours at 0. ^Q C, dried for 1 hour at 4 hours and 2 0 0 ° C at 1.2 0 ° C.

The molded body obtained in this way was heated from room temperature in nitrogen gas at a temperature rising rate of 10 ^ 0 ° C at a rate of 1,0'0 ° C, 1,500 ° C ^ 2,0, respectively. The temperature was raised to 100 ° C and 2,500 ° C, and calcined at that temperature.

New paper One —

A surface layer 1a made of high carbon was laminated. The layer thickness of the obtained surface layer 1a was l to 3 / m.

The mold 1 thus obtained was examined for its wettability to natural rubber latex solution, specific resistance and thermal conductivity. Table 1 shows the results.

Example 3

Using an evaporator, the polycarbodiimide solution obtained in Production Example 1 was concentrated to a resin solid content concentration of 50% by weight, and the resulting high-concentration polyposide solution was cast into a mold. Heat treated at 0 ° C for 20 hours, at 80 ° C for 20 hours, and at 120 ° C for 20 hours, released, and molded into a hollow-shaped poly-positive imide resin as shown in Fig. 5. Obtained.

The molded body was heated to 1,000 ° C, 1,500 ° C, 2,0 ° C in nitrogen gas at a rate of 0.2 ° C / min from room temperature in nitrogen gas. The temperature was raised to 00 ° C and 2,500 ° C, and calcined at that temperature to produce a hollow mold 1 entirely made of amorphous carbon as shown in Fig.5.

The mold 1 thus obtained was examined for its wettability with respect to a natural rubber latex solution, specific resistance, and thermal conductivity. Table 1 shows the results.

Example 4

The polycarbonate powder obtained in Production Example 2 was placed in a mold, heated and pressed under the conditions of 180 ° (80 kg Zcnf), cooled to room temperature, and released. A polycarbodiimide resin molded article having the shape shown in Fig. 6 was obtained. The surface of the molded body was polished and mirror-finished, and then fired under the same conditions as in Example 3 to produce a mold 1 shown in FIG.

The mold 1 thus obtained was examined for its wettability to a natural rubber latex solution, its specific resistance, and its thermal conductivity. Table 1 shows the results.

Example 5

Using a phenol resin (BRL # 2744 manufactured by Showa Polymer Co., Ltd.), a phenol resin molded article was molded under the same conditions as in Example 3, and the phenol resin molded article was molded. Was fired under the same conditions as in Example 3 to produce a hollow mold 1 having a shape as shown in FIG. 5 and made entirely of amorphous carbon.

Using the mold 1 thus obtained, the wettability to a natural rubber latex solution, the specific resistance value and the CD thermal conductivity were measured. Table 1 shows the results.

[Table 1] Firing temperature Wettability Specific resistance Thermal conductivity (cai (.C) —Evaluation (Ω · cm) 1 cm. Sec. ° C)

1, 000 〇 0.0006 0.3 Application 1, 500 〇 0.0006 0.3 Example

2 2,000 〇 0.0006 0.3

2,500 〇 0, 0006 0.3

1, 0G0 〇 0.0051

Allocation 1,500 〇 0.0048

An example

3 2,000 〇 0.0046 0.020

2,500〇

i

(Note) Wetability was evaluated when condoms could be manufactured.

Example 6

The polycarbodimid powder obtained in Production Example 2 was placed in a mold, and a polycarbodimid tree B molded body was formed in the same manner as in Example 4, and the root portion B was ground. Then, the surface of the main body M of the polybolymid resin molded body is polished and mirror-finished, and then formed into a double spiral shape as shown in FIG. The sintering was performed under the same conditions as in Example 3 to produce a mold 1 shown in FIG.

According to the molding die 1 of this embodiment, the double helical portion formed at the base B can be used as the heating region R having a higher electric resistance, and the resistance heating can be performed more efficiently. I can do it. In the molding die 1, reference numerals 1.5 denote electrodes of an AC heating power supply 10.

Industrial applicability

As is clear from the results of the above examples, the use of the mold for manufacturing an ultra-thin rubber molded article of the present invention makes it possible to form an ultra-thin rubber. --In the production of molded products, the complicated process of "peeling the molded product from the molding die and reattaching it to another inspection die" can be omitted in the inspection process, and the molding process, especially the heating and drying process Since the product can be heated and dried from the inner mold side, pinholes can be prevented as much as possible. In addition, the mold for producing an ultra-thin rubber molded product is lightweight, has good workability, and can be easily formed into various shapes. In particular, it is used as a mold for producing condoms. The required mirror finish of the required surface is easy.

Furthermore, according to the method for producing an ultra-thin rubber molded product of the present invention, since the above-mentioned mold is used, the inspection :! The entire production process, including the process, can be performed with a single mold, and the production of ultra-thin rubber molded products is performed continuously without interruption during the entire process. This is very useful industrially because it can improve production efficiency and minimize the occurrence of pinholes in the manufacturing process.

Claims

Range of request

(1) The main body of the mold body is immersed in a latex solution to adhere the latex to its surface, and the adhered latex is heated and dried to form ultra-thin rubber. This is a molding die for manufacturing products, and at least the surface of the main body of the mold body immersed in the latex liquid is formed of amorphous carbon, and the root of the mold body is formed. The molding die for manufacturing ultra-thin rubber molded products, characterized in that the part blue is provided with electrodes for energization and a heating area for generating resistance heat by energization.

(2) The production of the ultra-thin rubber molded product according to claim 1, wherein the core portion of the mold body is formed of a graphite material, and a surface layer of amorphous carbon is laminated on the surface of the core portion. Molds.

(3) The mold for manufacturing an ultra-thin rubber molded product according to claim 1, wherein the mold body is entirely formed of amorphous carbon and is formed in a hollow shape with an open base. .

(4) At least the amorphous force formed on the surface of the main body is made up of a polycarbonate resin, a phenol resin, a polyacrylonitrile resin, and a polyimidone. The electrode according to claim 1, which is obtained by molding a resin selected from the group consisting of a resin, polyvinyl chloride, polyvinylidene chloride, and a fluorinated resin, and firing the obtained molded body. Mold for manufacturing thin rubber molded products.

(5) The surface of the main body of the mold body, which is immersed in the latex liquid, is formed of amorphous carbon, and the base is provided with an electrode and a current-carrying electrode. Use a mold with a heating area that generates heat (a) an immersion step of sequentially immersing the mold in a latex liquid to adhere the latex to the surface of the mold;

(b) a heating / drying step of energizing the molding die to generate resistance heat in its heat generating region, thereby heating and drying the latex adhered to the surface of the molding die;

(c) Inspection process in which the molded product molded by the molding die is immersed in the electrolyte solution without being removed from this molding die, and the power is supplied to perform the pinhole inspection.

A method for producing an ultra-thin rubber molded article, characterized by having:

(6) The ultra-thin rubber molded article according to claim 5, wherein in the heating and drying step of the latex adhering to the surface of the molding die, heating and drying are performed by external heating and resistance heat generated by energizing the molding die. Production method.